Basic of Systemd
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Systemd is a system and service manager that provides modular, asynchronous, and concurrent services. It allows administrators to create snapshots of unit configurations. Some key capabilities it provides include listing and controlling systemd units and services. A service file template is also provided that defines properties like the service description, execution commands, and installation targets. Systemd-nspawn can be used to create lightweight containers with their own isolated namespaces.
![Lets Talk about systemd
Name: Praveen Kumar
Contact: kumarpraveen [AT] fedoraproject DOT org
Date: 2015-07-11
1](https://image.slidesharecdn.com/centosmeetup-150709092151-lva1-app6892/85/Basic-of-Systemd-1-320.jpg)
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Basic of Systemd
- 1. Lets Talk about systemd Name: Praveen Kumar Contact: kumarpraveen [AT] fedoraproject DOT org Date: 2015-07-11 1
- 2. Agenda • What is systemd • What capabilities it provides • How to use systemd • How a service file looks like • Intro about systemd-nspawn • Resources Agenda 2
- 3. What is systemd • Modular • Asynchronous and concurrent • Create snapshot • features a fully language-agnostic API ... Much more What is systemd 3
- 5. How to use systemd • Default init system for CentOS • List out units • systemctl list-units • List out services • systemctl list-units --type service • systemctl list-units --type service --all How to use systemd 5
- 6. • systemctl list-unit-files --type=service • ls /usr/lib/systemd/system/*.wants How to use systemd 6
- 7. How to use systemd cont... • List out targets • systemctl list-units --type targets • Check CGroup tree • systemd-cgls How to use systemd cont... 7
- 8. Service file Template [Unit] Description=The Apache HTTP Server After=network.target remote-fs.target nss-lookup.target [Service] Type=notify Environment=LANG=C ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND ExecReload=/usr/sbin/httpd $OPTIONS -k graceful Service file Template 9
- 9. # Send SIGWINCH for graceful stop KillSignal=SIGWINCH KillMode=mixed PrivateTmp=true [Install] WantedBy=multi-user.target Service file Template 10
- 10. systemd snapshot • Crate a snapshot of existing unit config $ sudo systemctl snapshot test $ sudo systemctl -all list-units | grep test $ sudo systemctl show test $ sudo systemctl isolate test.snapshot $ sudo systemctl delete test systemd snapshot 11
- 11. sysemd-nspawn • systemd-nspawn is a small utility which is use to create light weight containers • Setup a container $ sudo yum -y --nogpg --releasever=7 --installroot=/srv/mycontaine install systemd passwd yum vim-minimal sysemd-nspawn 12
- 12. sysemd-nspawn cont... • Setup container password $ sudo systemd-nspawn -D /srv/mycontainer • Start a container $ sudo systemd-nspawn -jbD /srv/mycontainer sysemd-nspawn cont... 13